Alloy



Patented June 17, 1930 UNITED STATES.

JOHN V. O. PALM, F CLEVELAND HEIGHTS,

GRAPHITE BRONZE COMPANY,

ALLOY No Drawing.

The present invention, relating, as indicated, to alloys is particularly directed to a new and improved copper alloy intended for various uses, such for example as in the cupffif like pistons which are employed in air brake and other fluid brake cylinders and for various other uses. One of the principal objects of the invention is the provision of a relatively inexpensive alloy having good physical properties for the purposes desired, and particularly high ductility, permitting it to be readily worked into the shapes required for the final articles. To the accomplishment of the foregoing and related ends, said invention, then, consists of the means hereinafter fully described and particularly pointed out in the claim.

The following description sets forth in detail ope approved combination of ingredients 20 and method of making same embodying my invention, such disclosed ingredients and procedure constituting, however, but one of various forms in which the principle of the invention may be used.

My improved alloy consists of copper as the predominant element, together with smaller quantities of aluminum, zinc and iron. I have found that an alloy can be produced which has much greater ductility and 30 greater tensile strength than the usual aluminum bronze alloys by combining from 85 to 90 per cent. of copper with 5 to 8 per cent. of zinc, about 4 per cent. of aluminum and a smaller amount of iron, preferably from one to two per cent., and that such an alloy has a tensile strength of approximately 100,000 pounds in rolled form and can be given a Brinnell hardness of as high as 175 While stillretaining a very great amount of ductilit In making the present alloy I first melt copper, to which are added aluminum and iron in the amounts named, and finally zinc,

and after the various ingredients have become well mixed the resulting alloy may be poured to produce flat sheets or other articles, it being desirable, however, to pour the material into the molds with as little turbulence as possible in order to maintain the aluminum in the" composition without'the above described in tent at 5 aluminum, 5 to 8 Application filed October 1, 1926. Serial No. 139,020.

formation of flaws in the resulting castings.

In order to secure the desirable ductility Zinc should be present in my improved alloy in an amount equal to 2 per cent. of the composition, or in even greater amount. \Vhile the quantities of the other ingredients may be varied somewhat, depending upon the particular use to which the material is to be put, I have found that compositions consisting of 90 parts of copper, 5 parts of zinc, 4 parts of aluminum and 1 part of iron are satisfactory, and also a composition consisting of 86 parts of copper, 8 parts of zinc, 4 parts of aluminum and 2 derstood that these proportions may be still further varied within the general limits making the alloy. The iron andalso, to some extent, the zinc act to prevent self-annealing and accordingly either rials may be somewhat reduced, provided the other is retained and the percentage thereof correspondingly increased, although it is highly desirable to maintain the zinc conper cent. or more if any considerable ductility is required in the alloy.

Other modes of applying the principle of my invention may be employed instead of the one explained, change being made as regards the process herein disclosed or the materials employed in carrying out the process, provided the ingredient or ingredients stated by the following claim or the equivalent of such stated ingredient or ingredients be employed. I

I therefore tiuctly claim as my invention An aluminum bronze alloy comprising 85 to 90 per cent. of copper, about 4 per cent. of per cent. of zinc, and 1 to 2 per cent. of iron.

Signed by me, 1926.

JOHN V. O. PALM OHIO, ASSIGNOR TO THE CLEVELAND. OF CLEVELAND, OHIO, A CORPORATION OF OHIO parts of iron, and it will be unparticularly point out and disthis 29th day of September,

of the composition, of these two mate-v 

